diff --git a/winestarter/config.py b/winestarter/config.py
index 5616a2f..3d55193 100644
--- a/winestarter/config.py
+++ b/winestarter/config.py
@@ -65,4 +65,4 @@ class ConfigAndBackup():
                 raise RuntimeError("Borg repo is broken.")
     
     async def gen_install_backup(self, name:str):
-        await self._run_backup(name.encode(), b".")
+        await self._run_backup(b"install_%s" + (name.encode(),), b".")